package Example2;

class Student {
    String name;
    int age;
    void  read(){
        System.out.println("大家好，我是"+name+",年龄"+age);
    }
}
public class Example2 {
    public  static void main(String[] args){
        Student stu1 = new Student() ;
        Student stu2 = null;
        stu2 = stu1;
        stu1.name = "小明";
        stu1.age= 20;
        stu2.age = 50;
        stu1.read();
        stu2.read();
    }
}
